ppmtoicr(1)               UNIX System V(30 July 1990)               ppmtoicr(1)


NAME
      ppmtoicr - convert a portable pixmap into NCSA ICR format

SYNOPSIS
      ppmtoicr [-windowname name] [-expand expand] [-display display] [-rle]
      [ppmfile]

DESCRIPTION
      Reads a portable pixmap file as input.  Produces an NCSA Telnet
      Interactive Color Raster graphic file as output.  If ppmfile is not
      supplied, ppmtoicr will read from standard input.

      Interactive Color Raster (ICR) is a protocol for displaying raster
      graphics on workstation screens. The protocol is implemented in NCSA
      Telnet for the Macintosh version 2.3.  The ICR protocol shares
      characteristics of the Tektronix graphics terminal emulation protocol.
      For example, escape sequences are used to control the display.

      ppmtoicr will output the appropriate sequences to create a window of the
      dimensions of the input pixmap, create a colormap of up to 256 colors on
      the display, then load the picture data into the window.

      Note that there is no icrtoppm tool - this transformation is one way.

OPTIONS
      -windownamename
                    Output will be displayed in name (Default is to use ppmfile
                    or "untitled" if standard input is read.)

      -expandexpand Output will be expanded on display by factor expand (For
                    example, a value of 2 will cause four pixels to be
                    displayed for every input pixel.)

      -displaydisplay
                    Output will be displayed on screen numbered display

      -rle          Use run-length encoded format for display. (This will
                    nearly always result in a quicker display, but may skew the
                    colormap.)

EXAMPLES
      To display a ppm file using the protocol:
          ppmtoicr ppmfile
      This will create a window named ppmfile on the display with the correct
      dimensions for ppmfile, create and download a colormap of up to 256
      colors, and download the picture into the window. The same effect may be
      achieved by the following sequence:
          ppmtoicr ppmfile > filename
          cat filename
      To display a GIF file using the protocol in a window titled after the
      input file, zoom the displayed image by a factor of 2, and run-length
      encode the data:


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ppmtoicr(1)               UNIX System V(30 July 1990)               ppmtoicr(1)


          giftoppm giffile | ppmtoicr -w giffile -r -e 2

BUGS
      The protocol uses frequent fflush calls to speed up display. If the
      output is saved to a file for later display via cat, drawing will be much
      slower. In either case, increasing the Blocksize limit on the display
      will speed up transmission substantially.

SEE ALSO
      ppm(5)

      NCSA Telnet for the Macintosh, University of Illinois at Urbana-Champaign
      (1989)

AUTHOR
      Copyright (C) 1990 by Kanthan Pillay (svpillay@Princeton.EDU), Princeton
      University Computing and Information Technology.





































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